HAS-BLED
Compute the HAS-BLED bleeding-risk score for a patient on (or being considered for) oral anticoagulation for atrial fibrillation.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Hypertension (uncontrolled, SBP > 160)
- Yes
- Age > 65
- Yes
Result: HAS-BLED total 2 (moderate bleeding risk).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-1
- Low risk of major bleeding per source (bleeds per 100 patient-years: 1.13 at score 0; 1.02 at score 1).
- 2
- Moderate risk of major bleeding per source (1.88 bleeds per 100 patient-years).
- >=3
- High risk of major bleeding per source. Caution and regular review of bleeding-risk factors advised per source.
What you enter
- Hypertension (uncontrolled, SBP > 160) (1)
- Abnormal renal function (1)
- Abnormal liver function (1)
- Prior stroke (1)
- Bleeding history or predisposition (1)
- Labile INR (1)
- Age > 65 (1)
- Drugs predisposing to bleeding, e.g. NSAIDs (1)
- Alcohol >= 8 drinks/week (1)
What this is
Inputs are the eight original Pisters 2010 variables - hypertension, abnormal renal or liver function, stroke history, prior bleeding, labile INR, age >65, and concurrent drugs or alcohol - and the score returns a 0-9 total with the published one-year major-bleed risk band.
When to use it
Pair this with CHA2DS2-VASc when deciding whether to start, continue, or modify anticoagulation for non-valvular AF, or when documenting shared decision-making in the chart. A high HAS-BLED does not by itself contraindicate anticoagulation; it flags modifiable risk factors (uncontrolled BP, NSAID use, labile INR) the team can address before changing therapy.
How this is calculated
Pisters R, et al. A novel user-friendly score (HAS-BLED). Chest. 2010;138(5):1093-1100. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.
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